Thanks for all the replies and help for my original "How to install grub onto an added drive?" question.
I actually have my nice new NVME SSD and PCIe adapter now and, quite a pleasant surprise, they "just work". My existing xubuntu 19.04 installation recognises the drive and I've used fdisk to partition it and mkfs to build a file system. As an experiment I unplugged all the other drives and tried to install xubuntu 19.10 on the new drive. It completed the installation without any errors but, not surprisingly, the system complains about there being no boot device when I try and boot it. So, confirmed, I can't boot from the new NVME drive. So, I have thought a bit and I'm wondering if my best strategy might be to dual boot xubuntu 19.04 and 19.10 for a while, this way I'll get a 'clean new' 19.10 installation and the old 19.04 installation files will be available to look at to copy configuration across. Finally to my question! How do I simply add xubuntu 19.10 as a boot option to my existing set up? As things stand the xubuntu 19.04 OS and /boot are all on /dev/sdb1 which is a SATA SSD. So it would make sense to simply add the ability to boot the xubuntu 19.10 installed on /dev/nvme0n1p2 to the existing /boot. How do I do this? -- Chris Green
